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## org.bouncycastle.crypto.engines
Class NaccacheSternEngine

    java.lang.Object
      org.bouncycastle.crypto.engines.NaccacheSternEngine

All Implemented Interfaces:
  AsymmetricBlockCipher

public class NaccacheSternEngine
extends java.lang.Object
implements AsymmetricBlockCipher

NaccacheStern Engine. For details on this cipher, please see https://www.gemplus.com/smart/rd/publications/pdf/NS98pkcs.pdf

Constructor Summary
`NaccacheSternEngine()`

Method Summary
`byte[]` | `addCryptedBlocks(byte[] block1, byte[] block2)` Adds the contents of two encrypted blocks mod sigma
`byte[]` | `encrypt(java.math.BigInteger plain)` Encrypts a BigInteger aka Plaintext with the public key.
`int` | `getInputBlockSize()` Returns the input block size of this algorithm.
`int` | `getOutputBlockSize()` Returns the output block size of this algorithm.
`void` | `init(boolean forEncryption, CipherParameters param)` Initializes this algorithm.
`byte[]` | `processBlock(byte[] in, int inOff, int len)` Process a single Block using the Naccache-Stern algorithm.
`byte[]` | `processData(byte[] data)` Convenience Method for data exchange with the cipher.
`void` | `setDebug(boolean debug)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### NaccacheSternEngine

    public NaccacheSternEngine()

Method Detail

### init

    public void init(boolean forEncryption,
                     CipherParameters param)

  Initializes this algorithm. Must be called before all other Functions.

  Specified by:
    `init` in interface `AsymmetricBlockCipher`
  Parameters:
    `forEncryption` - if true the cipher is initialised for encryption, if false for decryption.
    `param` - the key and other data required by the cipher.
  See Also:
    `AsymmetricBlockCipher.init(boolean, org.bouncycastle.crypto.CipherParameters)`

### setDebug

    public void setDebug(boolean debug)

### getInputBlockSize

    public int getInputBlockSize()

  Returns the input block size of this algorithm.

  Specified by:
    `getInputBlockSize` in interface `AsymmetricBlockCipher`
  Returns:
    maximum size for an input block.
  See Also:
    `AsymmetricBlockCipher.getInputBlockSize()`

### getOutputBlockSize

    public int getOutputBlockSize()

  Returns the output block size of this algorithm.

  Specified by:
    `getOutputBlockSize` in interface `AsymmetricBlockCipher`
  Returns:
    maximum size of the output block produced by the cipher.
  See Also:
    `AsymmetricBlockCipher.getOutputBlockSize()`

### processBlock

    public byte[] processBlock(byte[] in,
                               int inOff,
                               int len)
                        throws InvalidCipherTextException

  Process a single Block using the Naccache-Stern algorithm.

  Specified by:
    `processBlock` in interface `AsymmetricBlockCipher`
  Parameters:
    `in` - the input data
    `inOff` - offset into the in array where the data starts
    `len` - the length of the block to be processed.
  Returns:
    the resulting byte array of the encryption/decryption process.
  Throws:
    `InvalidCipherTextException` - data decrypts improperly.
  See Also:
    `AsymmetricBlockCipher.processBlock(byte[], int, int)`

### encrypt

    public byte[] encrypt(java.math.BigInteger plain)

  Encrypts a BigInteger aka Plaintext with the public key.

  Parameters:
    `plain` - The BigInteger to encrypt
  Returns:
    The byte[] representation of the encrypted BigInteger (i.e. crypted.toByteArray())

### addCryptedBlocks

    public byte[] addCryptedBlocks(byte[] block1,
                                   byte[] block2)
                            throws InvalidCipherTextException

  Adds the contents of two encrypted blocks mod sigma

  Parameters:
    `block1` - the first encrypted block
    `block2` - the second encrypted block
  Returns:
    encrypt((block1 + block2) mod sigma)
  Throws:
    `InvalidCipherTextException`

### processData

    public byte[] processData(byte[] data)
                       throws InvalidCipherTextException

  Convenience Method for data exchange with the cipher. Determines blocksize and splits data to blocksize.

  Parameters:
    `data` - the data to be processed
  Returns:
    the data after it went through the NaccacheSternEngine.
  Throws:
    `InvalidCipherTextException`

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